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It's official - Porsche's plug-in hypercar has been confirmed for production.

In an unexpected move, Porsche's board of directors has revealed that a production model based on the 918 Spyder concept will enter series production - in response to an overwhelming reaction from the public.

The concept car uses amid-mounted 493bhp 3.4-litre V8 derived from the firm's Spyder racingcar, capable of revving to 9200rpm, plus two electric motors,which add a further 160kW (215bhp). Around town, an E-drive mode allows the car to travel up to 16 miles onelectricity alone before switching to Hybrid mode, which uses both power sourcesin moderation. This gives claimed economy figures of 94mpg and 70g/km ofCO2.

There are no details yet on the powertrain for the production 918, but the announcement signals the company's commitment to electric and hybrid power. The Stuttgat based sports car manufacturer recently announced that an electric Boxster is on the cards, and we've already driven the GT3 R Hybrid race car.

Michael Macht, President and Chairman of the Porsche AG Board of Management said: 'Production of the 918 Spyder in a limited seriesproves that we are taking the right approach with Porsche IntelligentPerformance featuring the combination of supreme performance andefficient drivetrain concepts.'